Growth and morphology of CdS crystals by chemical transport method

Abstract

Crystal growth of cadmium sulfide by the chemical vapor transport method using iodine as a transporting agent was carried out in closed ampoules paying attention to the crystal morphology and the behavior of the liquid phase as it appeared during the transport reaction. When the amount of iodine was relatively small and the temperature relatively high, a layer of cadmium sulfide was deposited on the inner wall of the fused silica ampoule, and crystals such as needles (ca. 0.2 mm thick, up to 9 mm long) and/or “fish skeletons” often grew from the layer. When the amount of iodine was relatively large and the temperature relatively low, droplets of cadmium iodide were formed and polyhedrons (ca. 5 mm × 4 mm × 3 mm in dimensions) or other-shaped small crystals grew diversely. The transport of cadmium sulfide increased with increasing iodine concentration.